Cast boot



FIG. 1 is a frontal perspective view of a cast boot showing my newdesign in the position of use on the leg of a wearer, the broken lineshowings of a partial human form being for illustrative purposes onlyand forming no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, the opposite side beinga substantial mirror image;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof.

The ornamental design for a cast boot, as shown and described.